286 lines
10 KiB
TypeScript
286 lines
10 KiB
TypeScript
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import { checkTransactionResponse, Provider, TransactionRequest } from './provider';
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import { Network } from './networks';
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import { hexlify, hexStripZeros } from '../utils/convert';
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import { fetchJson } from '../utils/web';
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// The transaction has already been sanitized by the calls in Provider
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function getTransactionString(transaction: TransactionRequest): string {
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var result = [];
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for (var key in transaction) {
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if (transaction[key] == null) { continue; }
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var value = hexlify(transaction[key]);
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if ({ gasLimit: true, gasPrice: true, nonce: true, value: true }[key]) {
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value = hexStripZeros(value);
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}
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result.push(key + '=' + value);
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}
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return result.join('&');
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}
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function getResult(result) {
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// getLogs, getHistory have weird success responses
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if (result.status == 0 && (result.message === 'No records found' || result.message === 'No transactions found')) {
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return result.result;
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}
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if (result.status != 1 || result.message != 'OK') {
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// @TODO: not any
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var error: any = new Error('invalid response');
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error.result = JSON.stringify(result);
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throw error;
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}
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return result.result;
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}
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function getJsonResult(result) {
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if (result.jsonrpc != '2.0') {
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// @TODO: not any
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let error: any = new Error('invalid response');
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error.result = JSON.stringify(result);
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throw error;
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}
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if (result.error) {
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// @TODO: not any
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let error: any = new Error(result.error.message || 'unknown error');
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if (result.error.code) { error.code = result.error.code; }
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if (result.error.data) { error.data = result.error.data; }
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throw error;
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}
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return result.result;
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}
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// The blockTag was normalized as a string by the Provider pre-perform operations
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function checkLogTag(blockTag: string): number | "latest" {
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if (blockTag === 'pending') { throw new Error('pending not supported'); }
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if (blockTag === 'latest') { return blockTag; }
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return parseInt(blockTag.substring(2), 16);
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}
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export class EtherscanProvider extends Provider{
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readonly baseUrl: string;
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readonly apiKey: string;
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constructor(network?: Network | string, apiKey?: string) {
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super(network || 'homestead');
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let name = 'invalid';
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if (this.network) { name = this.network.name; }
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let baseUrl = null;
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switch(name) {
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case 'homestead':
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baseUrl = 'https://api.etherscan.io';
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break;
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case 'ropsten':
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baseUrl = 'https://api-ropsten.etherscan.io';
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break;
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case 'rinkeby':
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baseUrl = 'https://api-rinkeby.etherscan.io';
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break;
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case 'kovan':
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baseUrl = 'https://api-kovan.etherscan.io';
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break;
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default:
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throw new Error('unsupported network');
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}
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this.baseUrl = baseUrl;
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this.apiKey = apiKey;
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}
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perform(method: string, params: any) {
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//if (!params) { params = {}; }
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var url = this.baseUrl;
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let apiKey = '';
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if (this.apiKey) { apiKey += '&apikey=' + this.apiKey; }
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switch (method) {
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case 'getBlockNumber':
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url += '/api?module=proxy&action=eth_blockNumber' + apiKey;
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return fetchJson(url, null, getJsonResult);
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case 'getGasPrice':
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url += '/api?module=proxy&action=eth_gasPrice' + apiKey;
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return fetchJson(url, null, getJsonResult);
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case 'getBalance':
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// Returns base-10 result
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url += '/api?module=account&action=balance&address=' + params.address;
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url += '&tag=' + params.blockTag + apiKey;
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return fetchJson(url, null, getResult);
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case 'getTransactionCount':
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url += '/api?module=proxy&action=eth_getTransactionCount&address=' + params.address;
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url += '&tag=' + params.blockTag + apiKey;
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return fetchJson(url, null, getJsonResult);
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case 'getCode':
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url += '/api?module=proxy&action=eth_getCode&address=' + params.address;
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url += '&tag=' + params.blockTag + apiKey;
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return fetchJson(url, null, getJsonResult);
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case 'getStorageAt':
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url += '/api?module=proxy&action=eth_getStorageAt&address=' + params.address;
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url += '&position=' + params.position;
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url += '&tag=' + params.blockTag + apiKey;
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return fetchJson(url, null, getJsonResult);
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case 'sendTransaction':
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url += '/api?module=proxy&action=eth_sendRawTransaction&hex=' + params.signedTransaction;
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url += apiKey;
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return fetchJson(url, null, getJsonResult);
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case 'getBlock':
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if (params.blockTag) {
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url += '/api?module=proxy&action=eth_getBlockByNumber&tag=' + params.blockTag;
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url += '&boolean=false';
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url += apiKey;
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return fetchJson(url, null, getJsonResult);
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}
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throw new Error('getBlock by blockHash not implmeneted');
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case 'getTransaction':
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url += '/api?module=proxy&action=eth_getTransactionByHash&txhash=' + params.transactionHash;
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url += apiKey;
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return fetchJson(url, null, getJsonResult);
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case 'getTransactionReceipt':
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url += '/api?module=proxy&action=eth_getTransactionReceipt&txhash=' + params.transactionHash;
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url += apiKey;
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return fetchJson(url, null, getJsonResult);
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case 'call':
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var transaction = getTransactionString(params.transaction);
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if (transaction) { transaction = '&' + transaction; }
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url += '/api?module=proxy&action=eth_call' + transaction;
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url += apiKey;
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return fetchJson(url, null, getJsonResult);
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case 'estimateGas':
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var transaction = getTransactionString(params.transaction);
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if (transaction) { transaction = '&' + transaction; }
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url += '/api?module=proxy&action=eth_estimateGas&' + transaction;
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url += apiKey;
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return fetchJson(url, null, getJsonResult);
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case 'getLogs':
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url += '/api?module=logs&action=getLogs';
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try {
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if (params.filter.fromBlock) {
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url += '&fromBlock=' + checkLogTag(params.filter.fromBlock);
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}
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if (params.filter.toBlock) {
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url += '&toBlock=' + checkLogTag(params.filter.toBlock);
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}
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if (params.filter.address) {
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url += '&address=' + params.filter.address;
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}
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// @TODO: We can handle slightly more complicated logs using the logs API
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if (params.filter.topics && params.filter.topics.length > 0) {
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if (params.filter.topics.length > 1) {
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throw new Error('unsupported topic format');
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}
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var topic0 = params.filter.topics[0];
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if (typeof(topic0) !== 'string' || topic0.length !== 66) {
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throw new Error('unsupported topic0 format');
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}
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url += '&topic0=' + topic0;
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}
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} catch (error) {
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return Promise.reject(error);
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}
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url += apiKey;
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var self = this;
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return fetchJson(url, null, getResult).then(function(logs) {
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var txs = {};
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var seq = Promise.resolve();
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logs.forEach(function(log) {
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seq = seq.then(function() {
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if (log.blockHash != null) { return null; }
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log.blockHash = txs[log.transactionHash];
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if (log.blockHash == null) {
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return self.getTransaction(log.transactionHash).then(function(tx) {
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txs[log.transactionHash] = tx.blockHash;
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log.blockHash = tx.blockHash;
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});
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}
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return null;
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});
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});
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return seq.then(function() {
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return logs;
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});
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});
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case 'getEtherPrice':
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if (this.network.name !== 'homestead') { return Promise.resolve(0.0); }
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url += '/api?module=stats&action=ethprice';
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url += apiKey;
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return fetchJson(url, null, getResult).then(function(result) {
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return parseFloat(result.ethusd);
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});
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default:
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break;
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}
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return super.perform(method, params);
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}
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getHistory(addressOrName, startBlock, endBlock) {
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var url = this.baseUrl;
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var apiKey = '';
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if (this.apiKey) { apiKey += '&apikey=' + this.apiKey; }
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if (startBlock == null) { startBlock = 0; }
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if (endBlock == null) { endBlock = 99999999; }
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return this.resolveName(addressOrName).then(function(address) {
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url += '/api?module=account&action=txlist&address=' + address;
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url += '&startblock=' + startBlock;
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url += '&endblock=' + endBlock;
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url += '&sort=asc' + apiKey;
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return fetchJson(url, null, getResult).then(function(result) {
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var output = [];
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result.forEach(function(tx) {
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['contractAddress', 'to'].forEach(function(key) {
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if (tx[key] == '') { delete tx[key]; }
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});
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if (tx.creates == null && tx.contractAddress != null) {
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tx.creates = tx.contractAddress;
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}
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var item = checkTransactionResponse(tx);
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if (tx.timeStamp) { item.timestamp = parseInt(tx.timeStamp); }
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output.push(item);
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});
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return output;
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});
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});
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}
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}
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